Counseling intervention: Primary objective: to evaluate and compare, in at-risk populations, the efficacy of three different counseling methods in terms of propensity to come back for a HIV re-test. Secondary objectives: to evaluate and compare the efficacy of the counseling methods in terms of reported risk behavior and HIV knowledge as well as their acceptability and cost-effectiveness; describe the distribution of duration from HIV primary infection to detection; and estimate the prevalence of chronic hepatitis B and C, and syphilis in HIV-uninfected participants of targeted populations. Reminder intervention Primary objective: to evaluate and compare, in at-risk individuals who require frequent testing, the efficacy of reminders in terms of propensity to come back for a HIV re-test within 7 months. Secondary objective: to assess the cost-effectiveness of reminders. The interim analyses have shown that that some strategies are better than the others and the Advisory Committee recommended to use only the most efficient strategies (Computer assisted counseling and Scheduling an appointment and sending reminder to clients). In addition, CD4 cell count normal ranges in 30 HIV uninfected individuals in Thailand will be assessed. Transient elastometry (FibroScan) will be used to assess liver fibrosis in participants with and without viral hepatitis.
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Percentage of participants from at-risk populations coming for a HIV re-test
Timeframe: Within 7 months following the first visit